Carburetor



' Feb. 9 19.26.

` C. L. RAYFIELD CARBURETOR Filed April :2, 1923 Patentedfeh. 9, 1%26.

untreu srarns :lavarsi o s ic CHARLES L. RYFIELD, OF CHICAGO, ILLINOIS, ASSIGrNOR T0 BENEKE MANUFGTUB.- NG COMPANY, 0F GHECGO, LLINQS, A CORPORATON F LLNQS.

CARB URETOR.

Application filed April 2, 1923. Serial No. 629,334.

To all whom it may concern.' I

Be it known that I, CHARLES L. RAYFIELD, a citizen of the United States, and a resident of the `city of Chicago, in the county of Cook and State of Illinois, have invented certain new and` useful improvements in a Carburetor; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had "to the accompanying drawings, and to the numerals of reference marked thereon, which form a part of this specification.

This invention relates to improvements 1ncorporated in an interconnected air valve and pumping dash pot type of carburetor and comprises an auxiliary fuel nozzle and an additional accelerating nozzle adapted for rapid injection of fuel at the start of the a1r valve movement and prior to the opening of the auxiliary fuel nozzle by a further movement of the air valve.

It is well known that under sudden acceleration demands, especially in wet or foggy mixtures, such as are found in carburetors and intake manifolds handling the present day fuel made up of various fractional distillation products blended to form a so-called gasoline, that the sudden acceleration causes a momentary starving of the mixture due to the inertia of the globules of fuel carried by the air stream or flowing along the walls of the manifold, which do not accelerate at the same rate as the air stream. A wet mixture is admittedly as eliic'ient as a dry one for a constant speed and load as the temperatures within the cylinder insure vaporization, but for Widely variable loads and speeds as found in automotive vehicles the wet mixture gives serious distribution and acceleration problems. In an endeavor to obtain, a dry mixture, preheating of the air supply and various kinds of hot spots are in-use, resulting in varying degrees of loss of volumetric eficiency due to the smaller weight of air charged at a higher temperature; Heretofore various acceleration wells and the like s have been proposed and it is an object of this invention to provide a novel-form of preliminary injection nozzle that will practically anticipate the acceleration requirements by giving a moinentarily rich mixture sufficiently in advance of the requirements therefor,

so that a proper mixture will reach the cylinders during the time a lag of the regular fuel supply occurs during acceleration.

lt isan ob'ect of this invention to novide i which injection occurs being unaffected by any suction existing within the'carbiuretcr, so

that no after flow can occur after cessation of movement of the injecting mechanism.

It is a further object of this invention to provide a fuel injecting mechanism operating prior to the opening of a normally partially closed air valve, and having a positive cntoli' acting after a predetermined movement of the air valve.

Other and further important objects of this invention will be apparent from the disclosures in the specication and the accompanying drawings.

The invention (in a preferred form) is illustrated in the drawings and hereinafter more fully described.

On the drawings:

Figure l is a sectional elevation of a carburetor embodying the features of this invention, with parts in elevation. i'

Figure 2 is an enlarged fragmentary section on the line 2-2 ofFigure l.

As shown on the drawings:

The device of this invention is shown incorporated in a carburetor comprising a body member 1 having a flange 2 for attachment to the intake manifold or cylinder block of an internal combustion engine. A throttle valve 3 and compound nozzles 4 are indicated but not detailed as they are both well known in the prior art. A form of control valve for regulating the tiow of fluid from an air inlet chamber 5 is outlined in the ligure and corn.- prises a butterfly valve Shaving a linkage connection 7 to a sleeve air valve 8 whereby when the butterfly valve 6 is open the sleeve is openand 'vice versa, the linkage being interconnected by a linkage 9 to the auxiliary air valve to be described hereinafter to cause opening of the valves 6 and 8 when the auxiliary air valve opens.

A dash pot chamber 10 is illustrated as disposed below and separated from the air inlet chamber 5 by a partition 11, a fuel passage 12 opening into the dash pot chammi W i w liiiiiiii inriiii' iiiiifi iliiin iin :ii n i i'iin iiisi: ing iii@ insiinn n :i'iimsi iniiiingw.

7 :i iniivi'ingij pin iii iinii, im"- mniiiiniiiiiaiic n'iiii fi pin iiiiiiy (if iini'izmiiiii. iii'ii'iin 3i) :iiim'iiii@ ciiniczi :iir ifiili'e it. 'ifiiii iiiiiiiliii stein ii; plugged, as shown :it i iii ii piisitinn inimfniwlinte iii@ iiniiis of iliil (-iiiiiiiiioi :20 ini-med iiy the cnnniei'iim'e :mii iiiiziliingg iii, iinil :i pini-alii;Y of noiis iii infie viii, mi iiiiilci'i in (im simu iiiiiiiciiiiiii nimm sind iiiilow iii@ ping' 31 so ilizii: niiii lli@ einen :n: slmn'n :i passaggi: im' iiniii iii-fini iwlmv iiiix pinion uxiistx up iii'ei ijnlnl iii Sinni in iin) lIiiiilL' Iii. ont iii@ .iim'ci [iuris inir ilic cliiiniliinf 10 und inici the i'iilJiiizii' Sinni iiii'niigli ille pm'i's iiiinin tlm ping; und ilwimv mii; illu oiiiii'cx iii nimm tlif: iiii i'ailvc iii, With iliix i'iii'iiiiis piu-is in 'iiwii liiiiwiniiusi, iii' idling position, :1S nlinn'n in illu iii-inving. illu liniiiixii of iziin buis iis serves is a strip for iiie ilisi: 2i iinfi ilins (leien minns i'lie io-ini1ii nosiiiiin ffii" iin, :iii' iiilve which if; pl'cioinliiy Slightly nliiiie ilie lintimn iii illu niiiniiici i7 'forming tlm iiii' pas .miglia .ii will lie iippiiieni ilnit under no opel-iii inn vonilitinns wili :i suction cxii (in illu iniiii'is Si). :is is iii@ when with iliiA iinxiliiiii7 nomic within iii@ liniiy ni' iii@ riillnn'i-eini', iini'i iliiii ilii^i'0i`0i'0 finiti' :1 piiniiiini;1 :iciiifin Within ii'ic iiiisiipiii will lii'i :inil ifioii i'iiil ifini'ii iii@ m'iiicm; 53H, ri`lii 3` pnniliiniij :icizioli iS lniingiiii' :ilioiii lili' :i fiownwiii'il i'iiiivenicni ni iii i iiir mimA` sii-in :ind piston in 1eS1'icin;--;': in :in inwoning iinvoniiini 0iE tlii i'rgnliii' iiiiilii'eiiiii: ilimliiu f3, und ii: 'will im, (iviilrent iiifit i'iic umm' mig@ (if (im iiiisliingi ii) siiiii :is :i (iii'-oil` iiy envol-ini; ilio ioiwi' iiniis "ii, iii illu :siem 15 unil tliii [il'ciciiiingg ifliiiiici iimv oi iiwi iliinnig'li iii@ stem. AS liei'in iic'ime nientionil, i'iie iinie of iiiis ini-nii iiin iin iiiiiocl by :i snlistiini'ion 0f iifimslv inii of :i (iiiiernnt ioi'igiii.

Tim operation 0f :1 Oniinni'xiin: ifiiiippijii'i with iii@ iluvire 0i iliin invention is :is foilnws: Normally iinilm idling conflitifins iiir.: :iiixiiizinY :iii Yiilvi :imi inni, nomi@ :i1-e in :1n innpiulivo iiniiinn, :nu: shown in ilie iiiijiiin. iniriozising iiiininnil#` mi (im irziiiiiii'oioi fiile in in iiiiiniil liv iiii'niiln n'iii ini'iiiieiz illii iii pisimi m' sliiiiiin wiiiiiin ilw :iii i'liiiniiiii i :inil i'aiiiSi iiiri :inxiliiiif nii' i'iili'n in nini@ iif,i\\'11\\:ii'f|l liiicnnsc 'iliu` niiiiivi siii'i'iiirn iliiricnfif is Siiiijcci in niilisinniiiilli' fiinmf-s iiiii-i'ii: lii'ossiiiii. .i i'ci'y slight (ion'ii'iviiiii nuire-infini' (if iin: i'iilie Iii, siem l5 :imi iiii'i; Si ii; sniiiiiorit i0 Seal tliv imiter in the 'vision i352 anni mins- 0 :i pumping; :iciimi ilwi'coi limi, (":ii'i'iis iiiil up iilin iziiiinliii sileni, iii'niinifl (iin ping); iii. :z5 inei'ioiwii' iiisiii'ilioii, :mil ii :in i ilzi iuil iln'oiigii iliii ii'iiicos; 3f) :iliovn iii@ im i'ziivo. ii'iili lim i'iiaiiivn pimpin-linnn iii winni iinri piston simn'n, :i nim'ifinenl; iii' iiiil :iiiiwi'liii nl une i'iiiiigf-siifonii nl' :in incli is Siiiliiiiini; iin ciiiisfe f1 slimy mit Aiiniil ii'iiini i'i'ia iii'iiiisizinii iliis; slimy will continu@ in'iiiii iilio inni mig@ n ih@ iinliiiigg" if) cuis mii lli@ imma. Cain-@b of pini? f i1 mi cnnigil'iiieil gfionl'iwiiiii wirV movement of the air valve and stem. It

will be noted that the bulk of the fuel eject ed from the orifices 30 is discharged prior to the time that the largest diameter of the air valve clears the bottom of the air inlet passage l?, and that therefore this injection serves to :gire a momentary richness prior to the admission of any e\tray amount of air through the Yalre, thus accon'lplishing an object of this invention by forestalling the momentary leanness of mixture caused hy a sudden opening of the' throttle, i. e.7 demands due to sudden acceleration. If the acceleration is continued, the auxiliary noz- Zle 25 supplies the necessary extra fuel either by forced ejection due to movement. of the dash' pot piston or by suction after the air valve and dash pot have reached a position of equilibrium with the suction on the valve augmented by the spring pressure balancing the external air pressure and the velocity pressure on the conical air valve.

I am aware that numerous details of con.- struction may be varied through a wide range without departing from the princi ples of this invention, and I therefore do not purpose vlimiting the patent granted otherwise than necessitated by the prior art.

l claim as my invention:

l. ln a carburetor. an air Valve, a dash pot.l a piston in said dash pot, a tubular connection between said air valve and .said Alash pot piston having orifices therein above the main portion of said air valve, and means in and surrounding; said tubular connection adapted to close the passage between said dash pot and said orifices after a predetermined movement of said connectionu 2. ln a carburetor including a fuel supply means, a .mixing` chamber, and an auton'xatu:A air valve admittingr air thereto, a fuel pump mechanism connected with the air valve, and a sliding double tube fuel valve member sociat'ed with the pump mechanism.

8. In a carburetor including a fuel supply means7 a mixing' chamber and an automatic air valve, apump mechanism, a tabular connection forming a fuel passage between said pump and air valve, said tubular connection comprising means whereby the pump is adapted to be actuated by a downward' movement of the air Valve, and a sleeve valve associated with said connection and controlling,r the fuel passage.

4. Tn a carburetonan interconnected autfomatic'air valre and a fuel pumping dashpot` means for conducting fuel from said' ldashpot to outlets on the upperside of said air valve, and a sleeve valve associated therewith constructed to enable the fuel conductingmeans to discharge fuel above said air Valve only upon initial downward movement. y

ln testimony whereof have hereunto subscribed my name.

CHARLES L. RAYFELD. 

